<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <!-- 检查替换后的词是否有效 -->
    <script>
      var isValid = function (s) {
        let n = s.length - 3
        while (s.length != n) {
          n = s.length
          s = s.split('abc').join('')
        }
        if (s == '') return true
        return false
      }
      console.log(isValid('aabcbc'))
    </script>
  </body>
</html>
